JPH0486027A - Satellite reception system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a satellite reception system for receiving vertically polarized or horizontally polarized signals sent from communication satellites, such as JC-7), Super Bird, etc. 0 (Prior art) This satellite reception system receives a distributed signal from a satellite using an outdoor antenna, and converts the signal by switching between vertically polarized or horizontally polarized signals using a polarization switcher. A converter converts it into a satellite intermediate frequency signal and sends it to indoor equipment via a transmission line. Indoors, the receiver
A desired station is selected from among the satellite intermediate frequency signals and received by a television receiver. Also, from the indoor receiver, a controller is used to control the switching selection of the polarization switcher described above.

The left signal is sent to the polarization switcher.

(Problem to be Solved by the Invention) The conventional satellite reception system described above changes the voltage value of a single polarity to a higher or lower voltage in order to serve both as the operating power supply for the converter and as the control signal for the polarization switcher. Let's add it from the receiver to the transmission line. The polarization switch receives the voltage and selects, for example, a vertically polarized signal when a low voltage is applied, and selects, for example, a horizontally polarized signal when a high voltage is applied.

However, in the above-mentioned conventional satellite reception system, it is fine to send out a low voltage from the receiver to select a vertically polarized signal, but if a high voltage is sent out to select a horizontally polarized signal, this high Since the voltage is also used as a power source for operating the converter, power consumption is large and the converter generates unnecessary heat. Moreover, if the heat is not radiated, the electrical characteristics such as the noise figure will deteriorate, so there is a problem that heat must be radiated even if the shape is enlarged.

An object of the present invention is that polarization switching control and power supply can be performed using a high-frequency transmission line connecting an outdoor unit including an outdoor polarization switcher and an indoor receiver. Moreover, even if such a simple configuration is possible, it is an object of the present invention to provide a satellite reception system that does not consume unnecessary power and can prevent heat generation.

(Means for Solving the Problems) In order to solve the above problems, the present invention takes the measures described in the claims, and its effects are as follows.

(Function) A vertically polarized signal and a horizontally polarized signal are sent from the satellite and input to the polarization switching section of the outdoor unit.

In an indoor receiver, when reception of vertically polarized waves is specified using, for example, a selection key, a direct current of positive polarity, for example, is output from a switching control section. This passes through the receiver's power isolation filter and is applied to the outdoor unit via the transmission line. In the outdoor unit, this direct current passes through a power separation filter and is applied to the bridge circuit and polarization switching section. In the bridge circuit, a voltage of a constant value with a constant polarity is taken out from this direct current and supplied to each part within the unit as a power supply voltage. In addition, in the polarization switching section, switching is performed according to the polarity of the direct current, so only the vertically polarized signal of the signals from the satellite is sent to the subsequent stage, passes through the transmission line from the power separation filter, and is received. sent to the machine. This signal from the transmission line passes through a power isolation filter at the receiver and is sent to the tuner circuit.

On the other hand, in an indoor receiver, when reception of horizontally polarized waves is specified using, for example, a selection key, a direct current with a polarity opposite to that of vertically polarized waves, that is, negative polarity, is output. When this DC is received, at the outdoor unit, a constant polarity voltage is obtained in the bridge circuit in the same way as in the case of vertical polarization described above, and in the polarization switching section, a voltage with a constant polarity is obtained from the satellite, which is different from the case of vertical polarization described above. The horizontally polarized signal will be sent to the subsequent stage.

As described above, in the case of vertically polarized wave reception and the horizontally polarized wave reception, the DCs sent from the receiver to the transmission line differ only in polarity and have the same voltage value. Therefore, in the outdoor unit, there is no need to lower the voltage value unnecessarily in both vertically polarized wave reception and horizontal polarized wave reception, and power can be supplied efficiently.

(Example) The drawings showing the embodiments of the present application will be described below.

FIG. 1 is a schematic diagram of a satellite reception system. Reference numeral 1 denotes a parabolic antenna, which is installed outdoors using a column 2 and a support 3 as is well known, and receives distribution signals from a communication satellite. 4
5 represents a reflecting mirror, 5 represents an outdoor unit to be described later, and 6 represents a supporting arm. The support arm 6 is for supporting the outdoor unit 5 so that the radio wave introduction part 7 of the outdoor unit 5 is located at the focal point of the reflecting mirror 4. Reference numeral 8 denotes an output terminal of the outdoor unit 5, which is connected to an indoor receiver 10, which will be described later, via a coaxial cable 9 serving as a transmission line.

Next, each device placed indoors will be explained.

Reference numeral 10 denotes a receiver, which is used to select a desired station from among the signals of a large number of stations sent from the outdoor unit 5 via the coaxial cable 9. Reference numeral 11 indicates a channel selection switch used for selection, and is provided on the panel surface of the receiver 10. 12 is a vertical polarization selection key, and 13 is a horizontal polarization selection key, which are also installed on the panel surface of the receiver 10. 14 is a TV receiver, coaxial cable 15
It is connected to the receiver 10 using.

Next, FIG. 2 shows a circuit diagram of the main parts of the satellite reception system. Components corresponding to the previous time are indicated with the same reference numerals.

First, the outdoor unit 5 will be explained in detail.

The outdoor unit 5 includes a circular waveguide 20, a polarization switching section 21,
It is composed of a frequency conversion section 22, a power separation filter 23, and a bridge circuit 24. One end of the circular waveguide 20 is
It is connected to the aforementioned radio wave introducing section 7, and the other end is provided with a first globe 25 for receiving vertically polarized waves and a second globe 26 for receiving horizontally polarized waves.

The polarization switching unit 21 includes a high frequency amplification circuit 27 that operates with a voltage of positive polarity, and a high frequency amplification circuit 28 that operates with a voltage of negative polarity.
, mixing circuit 29, and rectifying diodes 30 and 3.
1 is in short supply. Next, the frequency conversion section 22 includes a high frequency amplification circuit 32, a mixer 33, a local oscillation circuit 34, and an intermediate frequency amplification circuit 35. 36, 37, and 38 are capacitors that pass high frequencies and block direct current, respectively. Next, the power supply separation filter n includes a capacitor 39 that passes high frequencies and blocks direct current, and a coil 40 that passes direct current and blocks high frequencies. trench bridge circuit 24
It is constructed by combining four diodes 41°42, 43.44 in a bridge type.

The above outdoor unit 5 is connected to a receiver 1o by a coaxial cable 9. Reference numeral 45 indicates a center conductor of the coaxial cable 9, and reference numeral 46 indicates an outer conductor.

Next, the receiver 10 will be explained in detail. Reference numeral 50 denotes a high frequency input terminal, which is used for connection with the outdoor unit 5 described above. 51 is a high frequency output terminal, which is used for connection with the television receiver 14. Reference numeral 52 indicates a power plug, and reference numeral 53 indicates a power transformer. 54 is a switching control section, the circuit configuration of which will be described later. 55 is a power separation filter,
Similar to the power separation filter 23, it is comprised of a capacitor 56 that passes high frequencies and blocks direct current, and a coil 57 that passes direct current and blocks high frequencies. 58 is Chu~
The circuit is shown below.

Next, the switching control section 54 will be explained in detail. 60 is a switch, and when the vertical polarization selection key I2 is pressed, the common contact C is electrically connected to the contact V side, and the soft horizontal polarization selection key 13 is connected.
The common contact C is configured to be electrically connected to the contact H side when is pressed. 61.62 is a rectifying diode, 63.64 is a smoothing resistor, 65°66, 67, 68
indicate smoothing capacitors.

Next, the operation of the satellite reception system having the above configuration will be explained.

(I) When receiving vertically polarized waves A vertically polarized channel is selected using the channel selection switch 11 of the receiver 10, and the vertical polarized wave selection key 12 is pressed.

At the switch mark, the contact V side is electrically connected to the contact C. The 100 volt commercial AC applied to the power plug 52 is stepped down by the power transformer 53 and rectified by the diode 62.
It is slipped by the resistor 64 and capacitor 67゜ field and becomes 15
Volt direct current. This direct current flows through the coaxial cable 9 as shown by the arrow in FIG. 2 and is applied to the outdoor unit 5. In the outdoor unit 5, current flows through each circuit as indicated by arrows in FIG. 2, so that the high frequency amplification circuit 27 operates, and the high frequency amplification circuit 32, local oscillation circuit 34, and intermediate frequency amplification circuit 35 also operate.

In the above state, the vertically polarized and horizontally polarized signals in the 11 to 12 GHz band from the satellite reflected by the reflector 4 and added to the radio wave introducing section 7 pass through the circular waveguide 2o and enter the first waveguide. probe 25 and second probe 26, respectively. The horizontally polarized signal induced by the second probe 26 is not sent to the subsequent stage because the high frequency amplifier circuit 28 is inactive.
The vertically polarized signal induced by the first globe 25 is amplified by a high frequency amplification circuit 27, passes through a mixing circuit 29, a high frequency amplification circuit 32, and is added to a mixer 33. These signals are converted into intermediate frequency signals in the 1 to 2 GHz band by the mixer 33 using local oscillation signals from the local oscillation circuit 34.
After being amplified by the intermediate frequency amplification circuit 35, the signal passes through the power separation filter 39 and the coaxial cable 9 and reaches the receiver 1o. In the receiver 10, these signals pass through a power supply separation filter 55, and a cheese circuit 55 selects only the signal of the designated channel (channel selection switch 11), and outputs it from the high frequency output terminal 51 to the television receiver. Sent to 14th.

In addition, since the polarization switching section 21 uses the high frequency amplification circuits 27 and 4 to select the polarization, only the signal of the desired polarization can be selected with less mutual interference.

(n) When receiving horizontally polarized waves Select a horizontally polarized channel with the channel selection switch 11 of the receiver 10, and press the horizontal polarized wave selection key I3.

In the switch 60, the contact H side is electrically connected to the contact C. The 100 volt commercial alternating current applied to the power plug 52 is
This results in a 15 volt DC with the opposite polarity to case I). This direct current flows through the coaxial cable 9 as shown by the arrow in FIG. 3 and is applied to the outdoor unit 5. In the outdoor unit 5, current flows through each circuit as shown by arrows in FIG. 3, so that the high frequency amplification circuit operates, and the high frequency amplification circuit 32, local oscillation circuit 34, and intermediate frequency amplification circuit 35 also operate.

Therefore, contrary to the case (I) above, the second probe 2
The horizontally polarized signal induced at 6 is amplified by the high frequency amplification circuit and sent from the mixing circuit 29 to the subsequent stage. These horizontally polarized signals reach the receiver 10 in the same manner as in the case (I) above, and the receiver 10 selects only the signal of the channel specified by the channel selection switch 11, and then receives the TV. Sent to machine 14.

In the above embodiment, the receiver 10 has a built-in tuner circuit 58, but this tuner circuit section is not included in the receiver 1.
It may be separate from 0, or may be built into the television receiver 14, for example.

(Effects of the Invention) As described above, in the present application, polarization switching control and power supply can be performed simultaneously using a single transmission line connecting an outdoor unit equipped with a polarization switcher and an indoor receiver. This allows the system to have a simple configuration.

Moreover, even with such a convenient system, it is possible to provide a satellite reception system that uses power efficiently and has excellent electrical characteristics such as noise figure because it does not generate heat.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of the satellite reception system, Figure 2 is a circuit diagram of the main parts of the satellite reception system for vertical polarization reception, and Figure 3 is the main part of the satellite reception system for horizontal polarization reception. Schematic diagram. 111...Parabola antenna, 5...-JI outside unit, 8-Fist output terminal, 9...Transmission line (coaxial cable)
, 10... Receiver, 11... Tuning switch, 12.
・Vertical polarization selection key, 13φ轡・Horizontal polarization selection key,
20... circular waveguide, 21... polarization switching section, 22...
... Frequency conversion section, 23... Power supply separation filter, Sae...
Noon-bridge circuit, 25--first probe, 26-
@・Second probe, 27゜A...high frequency amplification circuit,
54...Switching control unit, 55...-Power separation filter,
Guo fist tuner circuit, ω fist - switch. Patent applicant: Maspro Electric Works Co., Ltd. Representative Takashi Hatayama

Claims (1)

[Claims] In a satellite reception system comprising an outdoor unit connected to one end of a transmission line for bringing in high-frequency signals, and an indoor receiver connected to the other end of the transmission line, the outdoor unit includes a positive terminal from the receiver. a polarization switching unit that receives polarized or negative direct current and selects a polarized signal corresponding to that polarity and sends it to the subsequent stage, and a circuit in the outdoor unit that extracts a stable voltage from the positive or negative polarized direct current. and a power separation filter configured to send the signal from the polarization switching unit to the transmission line and direct current from the transmission line to the bridge circuit and the polarization switching unit, and further The receiver includes a switching control section that generates either positive or negative polarity direct current, and a device that sends the direct current from the switching control section to the transmission line and sends a high frequency signal from the transmission line to the tuner circuit. What is claimed is: 1. A satellite reception system characterized by comprising a power separation filter different from the above.